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Your search keyword '"Grande, Alf. P."' showing total 3 results
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3 results on '"Grande, Alf. P."'

1. Preconditioning of c-plane sapphire for GaN molecular beam epitaxy by electron cyclotron resonance plasma nitridation

Author

Heinlein, Cristian, Grepstad, Jostein K., Einfeldt, Sven, Hommel, Detlef, Berge, Torunn, and Grande, Alf. P.

Subjects
Nitrides -- Physiological aspects, Plasmons (Physics) -- Observations, Cyclotron resonance -- Usage, Physics
Abstract

Nitridation of c-plane sapphire is often used in molecular beam epitaxy of GaN to improve crystalline quality in deposited layers. X-ray photoelectron spectroscopy, reflection high and low energy electron diffraction, Auger sputter profiling and atomic force microscopy, were used to investigated the chemical and structural properties of sapphire (0001) substrate on exposure to nitrogen. A monolayer of surface nitride formed after around 60 minutes of nitridation.

Published
1998

3. The ferroelectric phase transition in LiTaO3 studied by neutron scattering

Author

Samuelsen, Emil J. and Grande, Alf P.

Abstract

Elastic neutron scattering from two reflections has been studied versus temperature, and the temperature dependence of the ferroelectric polarizationP(T) has been deduced. Neartc=601°C the dependence is found to be classical: (Tc-T)1/2. The study supports a model where the ferroelectric transition is accompanied by an order-disorder transition of the lithium ions.

Published
1976
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